Stealthcoin (XST) has been rebranded to Stealth (XST): https://twitter.com/stealthsend/status/993226001101545473 Stealthcoin provides a complete anonymity solution for cryptocurrencies. Stealthcoin has a fair distribution with nearly four hours of low block rewards, a small premine of 1%, and the long-term energy efficiency of proof-of-stake minting.
PumaPay is a comprehensive billing protocol that combines the best of traditional payment methods (credit cards) with blockchain-based solutions, and enables a more frequent use of cryptocurrencies in online & offline outlets. We offer a free-of-charge blockchain-based protocol that decentralizes a whole layer of transaction processing services and supersedes traditional and current blockchain-based billing methodologies